Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1473d6c6187c079…

MALICIOUS

PDF

74.3 KB Created: 2021-03-22 03:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c418070593ba0d63e3661d5fcbc12497 SHA-1: d52e83db3c8984dbb7995370a980bc434c17da39 SHA-256: b1473d6c6187c07925afe4e9fbdd81693dd214d16238c8a31aa5d5fe8de74a15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a 'PDF link farm', suggesting a phishing or SEO manipulation attempt. ClamAV and ML classifiers also flagged this file as malicious. While no scripts were directly extracted, the presence of numerous external URLs indicates an attempt to redirect the user to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/wix?keyword=styx+boat+on+the+river+ukulele+chords
    • https://gipalefujujal.weebly.com/uploads/1/3/1/3/131379678/kukuzukolosir-vizalusedojib-goxoloki.pdf
    • http://samozanyat.info/how_do_you_make_creamy_garlic_sauce_with_prawns03ewj.pdf
    • https://damobupakul.weebly.com/uploads/1/3/1/4/131453350/9094262.pdf
    • http://options.expert/kesikevunajorukarulibusgyqa.pdf
    • https://cdn.sqhk.co/xusopusavo/r41Bhgx/vuregipavan.pdf
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/rarakeramis_naragugexona.pdf
    • https://cdn.sqhk.co/pafevola/hgjchdr/detective_notes_cluedo_print.pdf
    • https://cdn.sqhk.co/bidelefo/idMwkon/busufapabasarudixemepimos.pdf
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/jusulovamagaxutak.pdf
    • http://pogadai.xyz/rome_total_war_barbarian_invasion_cheats_units_listrjbwn.pdf
    • https://cdn.sqhk.co/fapolokid/ieNdWjd/mini_racing_adventures_mod_apk_1._5._2.pdf
    • http://lamovingcompany.com/bimukoruduxauyiqh.pdf
    • https://femodamokej.weebly.com/uploads/1/3/4/5/134529999/bivawati_dowovo.pdf
    • http://digitaltoolsfor.xyz/17291723040rhj2q.pdf
    • https://cdn.sqhk.co/fitamorigob/ahchbNb/72380542280.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_647a5b64b73a49638ac069ee9d5f528b.pdf?index=true
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_f0cfff4e564b4f55ae9a8cb90031d651.pdf?index=true
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_84ac566e4d304d94ad4ba4661b715053.pdf?index=true
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_23dc1f8a798f4d20a3c17950b12cb871.pdf?index=true
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_82815efb1be84e26bbbc24eac426114e.pdf?index=true
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_bd78722308434c0d83a0dd90d572c9b1.pdf?index=true
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_6251c9660f8342638a07ab903996f0b0.pdf?index=true
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_94537ed43f6e433b987f238b5bbc2635.pdf?index=true
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_fa3a826493a04304a00f011c921f4a2e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f9.bin
d52d1340ddc89a82b77d53619bf8743ca29774de5b0434d6f638de24f7162a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 5444 bytes
font_01_sfnt_off0000ea73.bin
0601f98475acbe95a2438d7749d7e354bfba500a9652a1e976486ca8d22faab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 10416 bytes
font_02_sfnt_off00010e48.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E48 4324 bytes

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